Packing for self-balancing purposes.



F. LJUNGSTRUM. 91101111101 r011 SELF BALANCING PURPOSES;

AEPLIOATIOH FILED MAR. 17, 1911. I

Patented July 11, 1911 WITNESSES A TTORIIEY.

' To all it macaw:

, hereby declare the followingto be a full,-

- the art to which it appertain's to make and EBIEDBIK muncs'rnom,or-mmnnorivrma STOCKHOLM, swnnnn, assxenon TO -AK'1IEBOLAGETLJUNGSTRfiMS ANGTURB1N, OESTOCKHQLM, SWEDEN.

rac'xme so'n SELF-BALANCING rnnrosns.

"Be it known that I, Fannnrx La'unos'rnoM, engineer, a subject of. theKing of Sweden, randresldent of Liljeholmen, Stockholm, in the Kingdomof Sweden, have invented C81:-

t-a'in new and useful Improvements in Packiii'gs for Self-BalancingPurposes; ,and I do clear, and exact description of the inventlon, suchas will enable others skilled in use the same, reference being had tothe accompanying drawings, and to letters or figures .of referencemarked thereon, which form a part of this specification. i

In gasor steam turbines, compressors or the like, in which avane-c'arrying disk or drum is axially actuated by gasor steamressure ithas been attempted not only to alance the greater part of this pressure,but also to balance it in such a way-that without using cam bearings therotating disk or drum automatically will occupy its suitable position inspite of the variations in pressure. This is attained by providing thedisk or drum with a counter-pressure surface,- whereon there is acting apressure counteracting the axial pressure of the steam or gas.

In order to adjust the pressure and the counter-pressure as strictly as.,possible, so that the same will balance each other as nearaspossibl'e, the couriteppressure has been caused toact on a surface nhich was a limit of a pressure chamber, which communicated 5 by'means oflabyrinth packings with an sure chamber thereby also changing.

'inlet for the pressure medium, also with an outlet for the pressuremedium. These labyninth packings were made in such a way that one ofthem changed by flexure at the axial movements, the pressure in the presIt i is of great importance in such packings that the changes in thepacking passages be relatively great and effected by axial movementsofthe drumor disk. To thisend I provide each packing ring with at leastone flange projecting toward a proximate packing ring, overlapping orunderlapping it from theother side and. provided with a sharp corneredge the opposing rim having a shoulder or other part presentinganothersharp corner edge --:fi ,'"of at least one of said rings arranged forcontact with the edge Some part, preferably the first mentioned.

1s made than the rest and readily flexible,

snecmmion of Letters Patent. P t t July 11, 1 1 Application filed March17, 191;. Serial ga 615,037.

such part, serving as a portion of the wall sharp corners is such as tosecure themaximum flexure from the minimum movement of said rings towardand against each other.

The Invention is illustrated in the annexed drawing, on whicheralembodiments on a greater scale.

I n I I n I F gure 1 shows a radial turbine H1 longltudinal section.Figs. 2, 3 and 4 show sev-,

a indicates the turbine casing, b the shaft,

. c the rotating disk secured to the shaft, d

thevanes and c the labyrinth packing According to, Fig. 2 said packingconsists of anumber of axial rings f inserted into eafih other andsecured to disks g. Said rings are provided with lateral projections hcooperating'with edges 2' on the adjacentrings, said edges beingpreferably formed by recesses 72 in the rings. As shown, the recessesare placed in such a way that the leak-passages between the upper ringswill be increased, when the passages between the lower rings will remainunchanged or the reverse. The upper or lower rings may also be built inthe way shown in dotted hnesp no change inv the area of the upper orlower passages being caused at the movements. The edges 2' may also bemade with an inclined face as shown on the bottom part of Fig. 2..

Figs. .3 and 4 show embodiments, in whichonly every other ring isprovided with lateral projections. According to Fig. 3, the rings areeither of a conical shape' or provided with recesses it. According toFig. 4 the projections h consist of distinct parts not integral butsecured to the rings.

For the purpose of enabling the intro duction of the driving medium intothe outer vane rings at the overloading of the turbine, the wholelabyrinth acking .e is

divided into several groups, each one being of the constructiondescribed.

What I claim is 1. A labyrinth packing comprising rings which overlapalternately from opposite sides and are movable toward each other, at

least one of each two rings being provided with a flexible partconstituting-a portion of the wall of a fluid chamber, and every twodisks havingv also sharp corner edges opp0ed to each other for thepurpose of securing the maximum flcxure by the minimum movement of saidrings. A labyrinth packing comprising ring 5 overlapping :dternntelyfrom opposite sides, each of said rii'lgs' having a flexible ililHL"?thinner than the body of the ring and prkr vided with n sharp corneredge, every ring also having a part provided with a c0rrc- 1O spendingedge presented to the edge of the said [hinge oi, the proximate ring forthe purpose set forth.

labyrinth packing comprising rings overlapping alternately from oppositesides 15 and movable toward and from each other,

. further provided with corner edges ar- .i ranged to give the maximumflexure for the but fixed together on each side, said ringshaving-flexible parts each of which forms a portion of a fluid chambervaria le in capacity by such pressure, said parts be ng minimum movementof said rings toward and againet each other. I In testimony that I claimthe foregoing as my invention, I have signed my name in 25 presence oftwo subscribing witnessed i FREDRIK LJUNGSTROM. \Vitnesses: v

'Hrznrxe MELINDER, 4 I IARRY' Argznm.

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